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Ningbo Gangtong Zheli Fasteners Co., Ltd. is a leading manufacturer based in China, specializing in high-strength fasteners and a wide range of hardware products. Established in 2001, the company has grown steadily over the years, with its factory located in the Zhenhai Chemical Industrial Area of Ningbo and its headquarters and foreign sales department situated in the Jiangdong Eastern Business Center. The factory spans approximately 15,000 square meters, with a monthly production capacity of 2,000 tons. The company employs an integrated research system, supply chain management, large-scale warehousing, and advanced metal fastener technology, supporting a comprehensive procurement and distribution model for MRO (Maintenance, Repair, and Operations) materials. With annual sales exceeding $15 million, the company continues to expand its global footprint.
The product range includes bolts and nuts, self-tapping or drilling screws, lag screws, threaded rods, studs, washers, and more, all manufactured from both carbon steel and stainless steel. These products are exported worldwide, including North America, Europe, Australia, Russia, Southeast Asia, and the Middle East. They strictly adhere to international standards such as DIN, ANSI/IFI, JIS, BS, ISO, and GB, making them suitable for applications in architectural steel structures, bridges, oil pipelines, machinery equipment, furniture, vessels, and railways.
The company follows the ISO 9001:2000 quality management system throughout all stages of production, from raw material analysis to final inspection before shipment. Quality is at the core of our operations, and we continuously focus on improving product standards. We believe that quality is the lifeblood of any business, and we strive to cultivate a strong quality culture among our employees. In case of any issues reported by customers, we follow the 8D problem-solving method to ensure continuous improvement and customer satisfaction.
With a corporate spirit centered around "Employees are the foundation, customers come first, expertise drives progress, and quality is the priority," we welcome businesses from around the world to partner with us for mutual growth and long-term cooperation. Welcome to China, and welcome to Ningbo Gangtong Zheli Fasteners!
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**Thread Size & Technical Specifications**
| Thread Size | Pitch (mm) | K (mm) | e (A/B) | S (mm) | L (mm) |
|-------------|------------|--------|---------|--------|--------|
| M4 | 0.7 | 2.8 | 7.66 / - | 7 | 8-40 |
| M5 | 0.8 | 3.5 | 8.79 / 8.63 | 8 | 8-40 |
| M6 | 1.0 | 4.0 | 11.05 / 10.89 | 10 | 8-50 |
| M8 | 1.25 | 5.3 | 14.38 / 14.2 | 13 | 12-60 |
| M10 | 1.5 | 6.4 | 18.9 / 18.72 | 17 | 16-60 |
| M12 | 1.75 | 7.5 | 21.1 / 20.88 | 19 | 20-80 |
| M14 | 2.0 | 8.8 | 24.49 / 23.91 | 22 | 25-80 |
| M16 | 2.0 | 10.0 | 26.75 / 26.17 | 24 | 30-100 |
| M18 | 2.5 | 11.5 | 30.14 / 29.56 | 27 | 30-100 |
| M20 | 2.5 | 12.5 | 33.53 / 32.95 | 30 | 40-100 |
| M22 | 2.5 | 14.0 | 35.72 / 35.03 | 32 | 50-100 |
| M24 | 3.0 | 15.0 | 35.98 / 45.2 | 36 | 50-100 |
| M27 | 3.0 | 17.0 | 45.2 / 45.2 | 41 | 60-100 |
| M30 | 3.5 | 18.5 | 50.85 / 50.85 | 46 | 70-100 |
This detailed table provides critical dimensions and specifications for various metric thread sizes, ensuring compatibility and precision in industrial applications. Whether you're working on construction, mechanical engineering, or automotive projects, our fasteners meet the highest industry standards and are designed for durability, reliability, and performance.